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目的本文通过调查四川省西昌市邛海湖盆地区 4个乡 1 96个村民组中的 2 0个组的居民血吸虫病的感染情况 ,了解当地地理环境、生产条件对血吸虫病流行的影响。方法用 Kato-Katz法进行粪检 ,得出感染率 ;对 2 0个组进行地理环境分类、种植作物分类及生产条件和外围环境因素的调查。结果该地区的地势是由平地、阶地向梯地过渡 ,相对应的居民血吸虫病感染率也随梯 (阶 )地面积比例的增大而增高 ,两者呈正相关 ( rs=0 .739,P<0 .0 0 1 )。环境复杂的汇水区及环山堰的多少也与感染率呈正相关 ( rs=0 .793,P<0 .0 0 1及 rs=0 .75 8,P<0 .0 0 1 )。水稻种植比例的大小与血吸虫病感染率呈负相关 ( rs=-0 .72 6 ,P<0 .0 0 1 ) ,而经济作物如蔬菜、烤烟等的种植比例大小与血吸虫病感染率呈正相关 ( rs=0 .781 ,P<0 .0 0 1 )。结论平坝种植水稻区已不再是严重的血吸虫病流行区 ,而环境复杂的梯阶地区、汇水区血吸虫病流行严重
Objective To investigate the prevalence of schistosomiasis among 20 residents of 1 96 villagers groups in 4 townships in the Xuanchang Lake in Xichang City, Sichuan Province, and to understand the impact of local geographical conditions and production conditions on the prevalence of schistosomiasis. Methods The Kato-Katz method was used to detect the infection rate. The geography classification, crop classification, production conditions and environmental factors were investigated in 20 groups. Results The terrain of the area was from flatland to terraces, and the corresponding infection rate of schistosomiasis also increased with the increase of the proportion of ladder area (rs = 0.779, P <0 0 0 1). The complexity of the catchment area and the number of hillside weirs was also positively correlated with the infection rate (rs = 0.793, P <0.001 and rs = 0.758, P <0.001). The proportion of rice planting was negatively correlated with the infection rate of schistosomiasis (rs = -0.726, P <0.01), while the proportion of economic crops such as vegetables and flue-cured tobacco was positively correlated with the infection rate of schistosomiasis (rs = 0.781, P <0.0001). Conclusion The rice planting area in Pingba is no longer a serious epidemic area of schistosomiasis, but the schistosomiasis epidemic in catchment area is serious